RL-RTX - use of os_tmr_create, kill & call

Could some kind person give me a code snippet showing a typical use of os_tmr_create, _kill and _call.

I can't get my head around as to how these should be used and what they can be used for. I have them sort of working but seem to get multiple instances of timers which seems wrong. Right now I just want to be able to periodically run a function, and os_tmr looks like what I should be using.

As a more general are there any larger code examples of using the RTX, I mean more complex than the Keil examples, ie. perhaps a teaching book or something. To help me move forward with more confidence.

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